You can use a common USB cable or 30-pin charging cable to charge or sync your iPhone or Android device. But if you don’t wish your cables get tangled, the following Spixi sync & charging cable may be more suitable for you.
Spixi is a practical retractable USB sync and charging cable that measures 2.25 x 2.0 x 0.75 inches. As we can see from the images, the charging & sync cable features ultra portable design, and comes with a unique, retracting 2-foot cable made from an eco-friendly thermoplastic elastomer for durability, and using integrated Lightning connector, 30-pin connector or micro USB connector, you can conveniently sync or charge your iPhone 5, iPhone 4, Android phones or other devices. Moreover, the retractable design keeps the USB cable in the shell for portability and neatness when not in use.
The inventor of Spixi is raising fund at Kickstarter at present. Pledge $25 will let you own the retractable sync & charging cable. If you’re interested, jump to Kickstarter official site for more details.